import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/index")
public class IndexServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //返回一个主页(主页就是一个简单的html片段)
        //需要得到用户名是啥，从httpsession中就能拿到
        //此处getSession的参数必须是false,前面在登录的过程中，已经创建过会话了，此处是要直接获取到之前的会话

        HttpSession session=req.getSession(false);
        String username=(String)session.getAttribute("username");
        Integer count=(Integer)session.getAttribute("count");
        count += 1;
        //把自增之后的值，在写回到会话中
        session.setAttribute("count",count);
        resp.setContentType("text/html;charset=utf8");
        resp.getWriter().write("<h3>欢迎你"+username+"这是第"+count+"次访问主页</h3>");
    }
}
